Marianne$$ Schwartz, the owner of Handy Man$$ Rentals, rents carpet cleaners to contractors and$$ walk$-$in customers. She is interested in arriving at a forecast of rentals so that she can order the correct quantities of supplies that go with the cleaners. Data for the last $10$ weeks are shown here. $($only answer part b$).$

b$.$ The mean absolute deviation as of the end of week $10$ is $\_\_\_\_\_\_\_\_$ rentals. $($Enter your response rounded to two decimal places.$)$